30305290 has 32 divisors (see below), whose sum is σ = 58268160. Its totient is φ = 11323200.

The previous prime is 30305287. The next prime is 30305299. The reversal of 30305290 is 9250303.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (30305299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7305 + ... + 10675.

It is an arithmetic number, because the mean of its divisors is an integer number (1820880).

Almost surely, 2^30305290 is an apocalyptic number.

30305290 is the 4495-th pentagonal number.

30305290 is a deficient number, since it is larger than the sum of its proper divisors (27962870).

30305290 is a wasteful number, since it uses less digits than its factorization.

30305290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3438.

The product of its (nonzero) digits is 810, while the sum is 22.

The square root of 30305290 is about 5505.0240689755. The cubic root of 30305290 is about 311.7737031516.

Adding to 30305290 its reverse (9250303), we get a palindrome (39555593).

The spelling of 30305290 in words is "thirty million, three hundred five thousand, two hundred ninety".